GF Made a new friend at the gym

My girlfriend and I (28 and 25) both go to the gym regularly, but typically at different times due to work schedules and what not so usually we are not there together, and even if we are we just do our own thing, we don't workout together or anything. Lately when she has gone at her normal time, she has been talking to this guy there. She said they started talking when he asked if he could work in for the power rack. Now they see eachother there usually and sometimes spot eachother (really just him spotting her). She tells me they talk playfully a lot, sort of flirty, and he just helps her. She says when she does dumbell press he spots her and stands really close, so his crotch is basically right over her head. The guy is apparently taller than me, better looking than me, and definitely more muscular than me. I have noticed now when I see her get ready to go to the gym, she puts on make up and stuff to look better, and has gotten a few new pairs of gym pants that really show off her ass and legs. I tell her to just enjoy it, show off a bit for him and she certainly does. When I am home and she gets back from the gym, she is usually horny right away. No clue if anything will end up happening from this but I thought I would share. She knows I like to see her get attention from other guys so she tells me all these details.